ScienceUnlocking genetic mysteries with twin studiesTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience10/06/2014October 6, 2014In the first years of life it is the family that determines most of a child's experience. Parents remain the main reference points for many more years. But how do a person's own genes influence personality development?https://p.dw.com/p/1Bp6YAdvertisement